When I changed the fluid awhile back, I bought an 8.8" gasket and the bolts matched up. Leaked terribly (ended up redoing it with The Right Stuff instead), but the bolts matched, confirming it is an 8.8.
My 1995 3.0 I had before had a 7.5 in it... metal cover. So does the 8.8 in my 1984 F150.